COMPOSITION OF THE ATMOSPHERE. 



Gay-Lussac and Humboldt, after many experiments, which 



gave from 20-9 to zrz, settled on a mean of 21*0 p.c. 



Gay-Lussac himself gave as a mean of the air from mountains 



and from Paris 2i'49 



fzvoS 

 20'98 



21'03 

 21'03 

 2I"I3 

 2I"I5 

 21*o8 



2 1 '09 

 20*98 

 2i'o86 

 21 "006 



2I-I 



21'0 



\21'04 



Mean ai'o5 



De Saussure examined the air at Chambeisy and found 



Berthollet found 



Thom. Thomson 



Davy .......^.,.,., 



Vogel found on the Baltic 

 Hel-mbstadt do. 

 Dalton, at Manchester 



(in a N.E. wind) 



Doyere found zo'^ 



Regnault gave as the result of 1 00 specimens in Paris 20*9 1 3 



9 from Lyons and around 20"9i8 



30 „ Berlin 20-908 



10 „ Madrid , 20'9i6 



23 „ Geneva and Switzerland ........ 20909 



15 „ Toulon and Mediterranean 20*912 



5 „ Atlantic Orean 20*918 



1 „ Ecuador 



2 „ Pichincha, higher than Mont Blanc 20*949 



Mean of all foregoing ao'949 



Mean of the Paris specimens, 20*96. 



to 



21*05 p.c. 



2I*0 

 2 I'D 

 21*59 

 21*5 



zoy 



20-8 



21*15 



20*9 



20*73 

 20*85 

 2o*9s 



21^5 



20*999 

 20*966 

 20*998 

 20*982 

 2o*993 

 20*982 

 20*965 

 20*960 

 20*981 



20*q88 



b2 



